Patent US4289620A successfully refreshed from Google Patents.
US4289620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure glass column for high performance liquid chromatography
Assignee: Individual
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Filing: 1979-11-09
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Granted: 1981-09-15
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Expires: 1999-11-09
Abstract
Abstract An improved high pressure glass column for high performance liquid chromatography which comprises, both ends of the high pressure glass column on which flanges made of the same glass material are arranged, two column end fitting plugs which are made of a fluorine-contained resin and have a small bore for the effluent flow bored in their center, a piston part of a fitting plug inserted in the bore syringe part of the column end and a flange arranged to attach to the flange of the glass column tube, where the inside of the end of the piston part is formed with a conic shape and one or more narrow circled hollows are formed around the outlet of the piston part, two filters made of the fluorine-contained resin placed in between the both ends of the piston part of the fitting plug and the solvent material packed into the column, and two clips fitting and holding the two flanges of the column and the plugs.
Inventors
- 👤 Shoji Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:56
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01D15/10; B01D15/22; G; G01; G01N; G01N30/00; G01N30/02; G01N30/60; G01N30/6004; G01N30/6026; G01N30/6034; G01N30/6039; G01N30/6052; G01N30/6082
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
239 words
In a high pressure glass column for liquid chromatography, a high pressure glass column for high performance liquid chromatography which comprises: (a) a glass column having at each end thereof a flange made of the same material as said column, said each end communicating via a conical passage with a shorter column of smaller diameter and in which a chromatographic absorbent is packed; (b) a distributing filter made of a fluoropolymeric resin fitted in each said shorter column and tightly packed against said absorbent; (c) a fitting plug made of the same material as the filter, said plug having an external annular flange at the center portion thereof, one end of which is extended beyond the end of the shorter column and the other end of which is packed into the shorter column and contacts one said filter so that the outer face of each said fitting plug tightly contacts the inner face of the shorter column, wherein each said plug includes a small diameter axial bore and the outlet thereof is formed in a bowl-like shape, and a plurality of hollows are circumferentially formed in the plug above the bowl so that the mouth of the bowl may be enlarged to compress against the inside of the column tube and the hollows may be shrunk by the enlargement of the bowl; and (d) a clip fitting and holding the two flanges of the main column and the plug.
Claim 2
Dependent Claim
239 words
In a high pressure glass column for liquid chromatography, a high pressure glass column for high performance liquid chromatography which comprises: (a) a glass column having at each end thereof a flange made of the same material as said column, said each end communicating via a conical passage with a shorter column of smaller diameter and in which a chromatographic absorbent is packed; (b) a distributing filter made of a fluoropolymeric resin fitted in each said shorter column and tightly packed against said absorbent; (c) a fitting plug made of the same material as the filter, said plug having an external annular flange at the center portion thereof, one end of which is extended beyond the end of the shorter column and the other end of which is packed into the shorter column and contacts one said filter so that the outer face of each said fitting plug tightly contacts the inner face of the shorter column, wherein each said plug includes a small diameter axial bore and the outlet thereof is formed in a bowl-like shape, and a plurality of hollows are circumferentially formed in the plug above the bowl so that the mouth of the bowl may be enlarged to compress against the inside of the column tube and the hollows may be shrunk by the enlargement of the bowl; and (d) a clip fitting and holding the two flanges of the main column and the plug.
Claim 3
Dependent Claim
31 words
The high pressure glass column for high performance liquid chromatograph claimed in claim 1 wherein the ends of the high pressure glass column are 4 to 30 mm in inner diameter.
Claim 4
Dependent Claim
36 words
The high pressure glass column for high performance liquid chromatograph claimed in claim 1 wherein the inner diameter of the ends are reduced to form small syringe tubes having inner diameters of 4 to 30 mm.
Claim 5
Dependent Claim
37 words
The high pressure glass column for high performance liquid chromatograph claimed in claim 3 wherein the inner diameter of both ends are reduced to to form small syringe tubes having inner diameters of 4 to 10 mm.
Claim 6
Dependent Claim
29 words
The high pressure glass column for high performance liquid chromatograph cliamed in claim 1, wherein the filter and the fitting plug are made of at least one fluorine-contained resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |